1940 CMP developments

[David_Hayward (RIP)]

I have been sent some information that cements the Marmon-Herrington connection with CMPs. However in order to ensure accuracy may I once again appeal?

I need some photos of early GM/McKinnon transfer cases and those fitted to early F15A and say either FGT, F30, or F60 chassis? Likewise 1940 Marmon-Herrington cases? Alternatively proof either way that early Ford 4 x 4 and 6 x 4 chassis other than the F15A used GM cases, and the same viz-a-vie F15A. I lack an early Chevrolet Service Book and so although I have cut-away drawings of the two Ford cases, one for F15A [single-speed] and one for the others, I have nothing to compare with the GM version[s].

Was the M-H transfer case a single-speed or dual-speed?